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A hollow cylindrical tube 20 cm long is made of iron and its external and internal diameters are 8 cm and 6 cm respectively. the volume (in cubic cm) of iron used in making the tube is (Take `pi = 22/7`)
20 से.मी. लम्बी एक खोखली बेलनाकार ट्यूब लोहे की बनी है ओर उसका बाहरी ओर आन्तरिक व्यास क्रमशः 8 से.मी. और 6 से.मी. है। ट्यूब बनाने में प्रयुक्त लोहे का आयतन (घन से.मी. में) क्या होगा? (यह मानते हुए कि `pi = 22/7`)

A

A)1760

B

B)440

C

C)220

D

D)880

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A hollow cylindrical tube 20 cm long is made of iron and its external and internal diameters are 8 cm and 6 cm respectively. The volume (in cubic cm) of iron used in making the tube is (Taken pi=22//7 )

A hollow cylindrical pipe is made of iron. Its external and internal radii are 8 cm and 7 cm respectively and it is 35 cm long. If 1 cm^3 iron weight 8g, then the weight of the pipe is.

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The radii of two circular faces of the frustum of a cone of height 21 cm are 3 cm and 2 cm respectively. What is the volume of the frustum of the cone in cubic cm? (Take pi = 22/7 ) 21 सेमी ऊंचाई वाले शंकु के छिन्नक के दो वृताकार फलकों की त्रिज्या क्रमशः 3 सेमी और 2 सेमी है। घन सेमी में शंकु के छिन्नक का आयतन कितना होगा ?

The internal and external radii of a hollow hemispherical vessel are 6 cm and 7 cm respectively. What is the total surface area (in cm^2 ) of the vessel? एक खोखले गोलार्द्ध पात्र की आंतरिक और बाहरी त्रिज्याएं क्रमशः 6 सेमी व 7 सेमी है। पात्र का कुल पृष्ठीय क्षेत्रफल (वर्ग सेमी में) कितना है?

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